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Use of Estimates	9 Months Ended
Use of Estimates	Jan. 31, 2012
Use of Estimates [Abstract]
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions. Actual results could differ from those estimates. Estimates may affect the reported amounts of assets and liabilities and revenues and expenses, and the disclosure of contingent assets and liabilities